Since some of this is spoiler-ish, though I'd post this over here...
Jason was taking questions on Twitter earlier, though I'd post the Q&A here. (EDIT: most smiley faces are my commentary on either the answers, or once or twice the questions)
Q: Hey, is Gus Rudy's boyfriend "Kenny" from the Cosby Show? Yeah I could google it but it would be cooler if you would answer.
A: no. no he is not.
Q: Well, if TPTB would let you continue with the character twitters... we'd need a Lassie Twitter, STAT!
A: iiiiiiiiiiiiiiiit's not gonna happen.

Q: But you do have a tv show to write and very hyper Psych-Os to please. I asked USA to give Jason a raise and Tim a keg of beer.
A: neither would change anything/happen.
Q: Will Lassiter wear a cowboy hat for High-Noonish?
A: haven't seen the dailies yet. so lets go with maybesortaish?
Q: Was it written into the script for him to wear one?
A: i can't read!
Q: how much can we expect to see of abigail lytar (rachael leigh cook) in season four? thanks
A: a lot.
Q: Has Shawn ever want to drive an ice cream truck?
A: funny you should ask that...keep watching.
Q: show questions? great: when am i filming my love scene with Dulé hill?
A: tonight. in your dreams holla!
Q: got any juice spoilers (since you're answering questions)

A: we are on the verge of casting our biggest guest star to date. itS big.
Q: Show questions like... when Shawn gets shot this season... where does he get shot?
A: not answering.
Q: Does Gus really look better in white loafers?
A: who doesnt
Q: Who selects the music? I had to d/l Space Age Love Song after the high school reunion episode.
A: steve does.
Q: Whose idea are the Psych Outs?
A: james and Dulé think of them.
Q: That's what I guessed. Thanks! So did they come up with "Ebony & Ivory" as well? That's 1 of my favorite commercials ever.
A: ha that was actually USA.
Q: How do you determine how many scripts each writer will create for each season?
A: names in a hat.
Q: maggie lawson has a new show, does that mean she won't be back as Jules? What say you?
A: of course she'll be back. she is the hardest working woman in show bizness.
Q: Any special twists to the Psych theme song this season? (e.g. the X-mas remix, the one in Spanish, etc.)?
A: i think so, we might doing a bollywood version, dont hold me to that though.

Q: This season, will @shawnspecnr and @croutonbuster be updating with tweets relative to episodes?
A: not sure. maaaaaaaaaybe
Q: How many eps will James Roday co-write this season?
A: 3.
Q: Can you reveal if Shawn handles a gun more like Jim Rockford, Harry Callahan or Don Knotts this season?
A: think JohnCusack in Grosse Point Blank
Q: gotta know...what's up with the pineapple obsession???
A: they are full of delicious flavor.
Q: will there be more pineapples this season? and if so will they be more difficult to spot?
A: they are extremely difficult this season.
Q: Ay Berger, when are they gonna let you write an episode?
A: shhhhhhhhhhhhhhhhhh don't jinx it.
Q: What's one 80's movie that Shawn would never reference?
A: the one with michael j fox and joan jett...actually i dont know
Q: Any chance of the rubber frog being brought back? (I have a vested interest, LOL)
A: actually i think that question is being asked during the online interviews tomorrow via internet by you. Sarah right?
Q: LOL, who me? Yes... I did ask that through the boards
A: well your diligence pays off.

Jason knows who I am!!!
Q: Is Gus ever going to get another date?
A: never. ever. ever. soon.
Q: Will the three hole punch be mentioned in an eppy ?
A: no? i dunno.
Q: how many lines per episode are usually ad-libbed? There's one line about "the largest strawberry I've ever seen" I was SURE was
A: lol fine, I'll be more specific! do they ad-lib more or less than three lines?

Q: exactly? um....27?
A: more.
Q: Will you guys reference twitter on the show? lol
A: yes. but not this one.
Q: Is lassiter gonna start dating anybody?
A: no plans yet. never rule it out.
Q: What is that person talking about the three hole punch? I missed something? These people are serious Psych watchers!!
A: you. have. no. idea. how. serious.

(The 3 hole punch question was BTC's)
Q: Any cameos by the writers, assistants, anyone?
A: unfortunately canadian union laws forbid it now. they capped berman and anupam.
Q: yes, for three episodes straight.
A: okay..last question for me. Will Shawn sniff any more phones like in Tuesday the 17th?
Q: Got any good tips for that post-lunch "I can't write anything that doesn't suck" lull?
A: a long walk.
Q: Are you ever scared by us Psych-Os?
A: yes.
Q: are we ever gonna get a special episode where Gus & Shawn team up with Monk? Maybe? Please?
A: sadly no. not looking like it's gonna happen.
Q: Any plans for *any* crossovers... ever?
A: We're doing a crossover with Sixteen And Pregnant
Q: Producers, writers, and the cast are answering the internet questions tomorrow?
A: just producers. writers later this month.
Q: Does that include Roday and Dulé since they're producers or are we just getting Steve, Henze, and Kelly?
A: S, H & K. Let. me. go.
Q: what is the first 80's reference in the new season???
A: hmmm. I think it's the karma chameleon one in the spots.
Q: Not strictly a show question, but have your fingers begun bleeding yet?
A: just my eyes.
Q: When will you have the always underappreciated Greg Grunberg on the show?
A: that would be cool.
And I agree with Tim: "Wow, Berger. You're on fire! -tm"